Don't use WTF_CPU_MIPS when building for mips64

[Alberto Garcia]

We want that the build system detects automatically when to enable the JIT, but we can't do it with mips64 as we do it for mips, since the former is not supported and results on a build failure:

In file included from Source/JavaScriptCore/jit/GPRInfo.h:28,
                 from Source/JavaScriptCore/interpreter/VMEntryRecord.h:28,
                 from Source/JavaScriptCore/interpreter/StackVisitor.h:29,
                 from Source/JavaScriptCore/interpreter/CallFrame.h:29,
                 from Source/JavaScriptCore/runtime/ClassInfo.h:25,
                 from Source/JavaScriptCore/runtime/Structure.h:28,
                 from Source/JavaScriptCore/bytecode/ArrayProfile.h:29,
                 from Source/JavaScriptCore/llint/LLIntOffsetsExtractor.cpp:28:
Source/JavaScriptCore/assembler/MacroAssembler.h:69:2: error: #error "The MacroAssembler is not supported on this platform."

There's a separate WTF_CPU_MIPS64 for this architecture.

[Alberto Garcia]

Created attachment 347832 [details]
Patch

[Michael Catanzaro]

Comment on attachment 347832 [details]
Patch

* Reviewed all the checks in existing CMake code
 * Verified this matches WTF's WTF_CPU_MIPS64 macro
 * Good!

[Alberto Garcia]

Committed r235194: <https://trac.webkit.org/changeset/235194>

[Radar WebKit Bug Importer]

<rdar://problem/43617883>