Make the String initialization on the function side of String::number()

Make the String initialization on the function side of String::number()
https://bugs.webkit.org/show_bug.cgi?id=95940

Reviewed by Benjamin Poulain.

Source/JavaScriptCore:

* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.def:

Source/WebKit2:

* win/WebKit2.def:
* win/WebKit2CFLite.def:

Source/WTF:

Un-Inline String::number() to make the String initialization done on the function side
instead of being on the caller side.

* GNUmakefile.list.am:
* WTF.gypi:
* WTF.pro:
* WTF.vcproj/WTF.vcproj:
* WTF.xcodeproj/project.pbxproj:
* wtf/CMakeLists.txt:
* wtf/text/IntegerToStringConversion.cpp: Removed.
* wtf/text/IntegerToStringConversion.h:
(WTF::numberToStringImpl):
(WTF::numberToStringSigned):
(WTF::numberToStringUnsigned):
* wtf/text/WTFString.cpp:
(WTF::String::number):
* wtf/text/WTFString.h:

Tools:

* TestWebKitAPI/Tests/WTF/IntegerToStringConversion.cpp:
(testBoundaries):
(testNumbers):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@127991 268f45cc-cd09-0410-ab3c-d52691b4dbfc