Make InitRuntimeNumberState's return type reflect its infallible nature.

js/src/jsnum.cpp

@@ -991,14 +991,10 @@ js::FIX_FPU()
 #endif
 }
 
-bool
+void
 js::InitRuntimeNumberState(JSRuntime* rt)
 {
     FIX_FPU();
-
-    // XXX EXPOSE_INTL_API has become true all the time, meaning this is
-    //     no longer fallible, and we should change its return type.
-    return true;
 }
 
 JSObject*

js/src/jsnum.h

@@ -34,8 +34,7 @@ namespace js {
 
 class StringBuffer;
 
-extern MOZ_MUST_USE bool
-InitRuntimeNumberState(JSRuntime* rt);
+void InitRuntimeNumberState(JSRuntime* rt);
 
 /* Initialize the Number class, returning its prototype object. */
 extern JSObject*

js/src/vm/Runtime.cpp

@@ -325,8 +325,7 @@ JSRuntime::init(uint32_t maxbytes, uint32_t maxNurseryBytes)
     /* The garbage collector depends on everything before this point being initialized. */
     gcInitialized = true;
 
-    if (!InitRuntimeNumberState(this))
-        return false;
+    InitRuntimeNumberState(this);
 
     JS::ResetTimeZone();