community/firefox: build issues with WasmBaselineCompile on aarch64

Firefox fails to build on aarch64:

Build errors

./home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:661:13: error: explicit specialization in non-namespace scope 'class js::wasm::BaseRegAlloc'
  661 |   template <>
      |             ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:662:8: error: template-id 'hasFPU' in declaration of primary template
  662 |   bool hasFPU() {
      |        ^~~~~~~~~~~~~~~~~~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:747:17: error: too many template-parameter-lists
  747 |   FloatRegister allocFPU() {
      |                 ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:752:13: error: explicit specialization in non-namespace scope 'class js::wasm::BaseRegAlloc'
  752 |   template <>
      |             ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:753:17: error: expected ';' at end of member declaration
  753 |   FloatRegister allocFPU() {
      |                 ^~~~~~~~
      |                         ;
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:753:17: error: 'js::jit::FloatRegister js::wasm::BaseRegAlloc::allocFPU' conflicts with a previous declaration
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:738:8: note: previous declaration 'void js::wasm::BaseRegAlloc::allocFPU(js::jit::FloatRegister)'
  738 |   void allocFPU(FloatRegister r) {
      |        ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:753:25: error: expected unqualified-id before '<' token
  753 |   FloatRegister allocFPU() {
      |                         ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp: In member function 'js::wasm::RegF32 js::wasm::BaseRegAlloc::needF32()':
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:937:27: error: invalid use of non-static member function 'void js::wasm::BaseRegAlloc::allocFPU(js::jit::FloatRegister)'
  937 |     return RegF32(allocFPU());
      |                   ~~~~~~~~^~~~~~~~~~~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:738:8: note: declared here
  738 |   void allocFPU(FloatRegister r) {
      |        ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:937:18: error: expected primary-expression before '(' token
  937 |     return RegF32(allocFPU());
      |                  ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:937:27: error: invalid use of non-static member function 'void js::wasm::BaseRegAlloc::allocFPU(js::jit::FloatRegister)'
  937 |     return RegF32(allocFPU());
      |                   ~~~~~~~~^~~~~~~~~~~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:738:8: note: declared here
  738 |   void allocFPU(FloatRegister r) {
      |        ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:937:46: error: expected primary-expression before ')' token
  937 |     return RegF32(allocFPU());
      |                                              ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp: In member function 'js::wasm::RegF64 js::wasm::BaseRegAlloc::needF64()':
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:951:27: error: invalid use of non-static member function 'void js::wasm::BaseRegAlloc::allocFPU(js::jit::FloatRegister)'
  951 |     return RegF64(allocFPU());
      |                   ~~~~~~~~^~~~~~~~~~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:738:8: note: declared here
  738 |   void allocFPU(FloatRegister r) {
      |        ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:951:18: error: expected primary-expression before '(' token
  951 |     return RegF64(allocFPU());
      |                  ^
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:951:27: error: invalid use of non-static member function 'void js::wasm::BaseRegAlloc::allocFPU(js::jit::FloatRegister)'
  951 |     return RegF64(allocFPU());
      |                   ~~~~~~~~^~~~~~~~~~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:738:8: note: declared here
  738 |   void allocFPU(FloatRegister r) {
      |        ^~~~~~~~
/home/buildozer/aports/community/firefox/src/firefox-83.0/js/src/wasm/WasmBaselineCompile.cpp:951:45: error: expected primary-expression before ')' token
  951 |     return RegF64(allocFPU());
      |                                             ^

See: https://build.alpinelinux.org/buildlogs/build-edge-aarch64/community/firefox/firefox-83.0-r1.log