Initial implementation of WebAssembly function compiler

Initial implementation of WebAssembly function compiler
https://bugs.webkit.org/show_bug.cgi?id=148734

Patch by Sukolsak Sakshuwong <sukolsak@gmail.com> on 2015-09-03
Reviewed by Filip Pizlo.

This patch introduces WASMFunctionCompiler, a class for generating
baseline JIT code for WebAssembly functions. The source for each
WebAssembly function is parsed in two passes.
- The first pass is done by WASMFunctionSyntaxChecker when the
  WebAssembly module is initialized. It validates the syntax,
  determines the start and the end offsets in the source, and
  calculates the stack height of the function.
- The second pass is done by WASMFunctionCompiler when the function
  is about to be executed.
This patch doesn't calculate the correct stack height nor generate
the correct code. That will be done in a subsequent patch.

* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
* JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
* JavaScriptCore.xcodeproj/project.pbxproj:
* wasm/JSWASMModule.h:
(JSC::JSWASMModule::functionStartOffsetsInSource):
(JSC::JSWASMModule::functionStackHeights):
* wasm/WASMFunctionCompiler.h: Added.
(JSC::WASMFunctionCompiler::WASMFunctionCompiler):
(JSC::WASMFunctionCompiler::startFunction):
(JSC::WASMFunctionCompiler::endFunction):
(JSC::WASMFunctionCompiler::throwStackOverflowError):
(JSC::WASMFunctionCompiler::localAddress):
* wasm/WASMFunctionParser.cpp:
(JSC::WASMFunctionParser::checkSyntax):
(JSC::WASMFunctionParser::compile):
(JSC::WASMFunctionParser::parseFunction):
* wasm/WASMFunctionParser.h:
* wasm/WASMFunctionSyntaxChecker.h:
(JSC::WASMFunctionSyntaxChecker::startFunction):
(JSC::WASMFunctionSyntaxChecker::endFunction):
(JSC::WASMFunctionSyntaxChecker::stackHeight):
* wasm/WASMModuleParser.cpp:
(JSC::WASMModuleParser::parseFunctionDeclarationSection):
(JSC::WASMModuleParser::parseFunctionDefinition):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@189284 268f45cc-cd09-0410-ab3c-d52691b4dbfc