Bug 1752099 part 3 - Inline ComputeJitSupportFlags into its now sole caller. r=lth

Depends on D137024

Differential Revision: https://phabricator.services.mozilla.com/D137025

js/src/jit/JitContext.cpp

@@ -107,21 +107,17 @@ bool jit::InitializeJit() {
   InitARMFlags();
 #endif
 
-  // Note: jit flags need to be initialized after the InitARMFlags call above.
-  ComputeJitSupportFlags();
-
-  CheckPerf();
-
 #ifndef JS_CODEGEN_NONE
   MOZ_ASSERT(js::jit::CPUFlagsHaveBeenComputed());
 #endif
-  return true;
-}
 
-void jit::ComputeJitSupportFlags() {
+  // Note: jit flags need to be initialized after the InitARMFlags call above.
   JitOptions.supportsFloatingPoint = MacroAssembler::SupportsFloatingPoint();
   JitOptions.supportsUnalignedAccesses =
       MacroAssembler::SupportsUnalignedAccesses();
+
+  CheckPerf();
+  return true;
 }
 
 bool jit::JitSupportsWasmSimd() {

js/src/jit/JitContext.h

@@ -149,10 +149,6 @@ class JitContext {
 // Process-wide initialization of JIT data structures.
 [[nodiscard]] bool InitializeJit();
 
-// Call this after changing hardware parameters via command line flags (on
-// platforms that support that).
-void ComputeJitSupportFlags();
-
 // Get and set the current JIT context.
 JitContext* GetJitContext();
 JitContext* MaybeGetJitContext();