Fix memory corruption in ANGLE shader translator.

Fix memory corruption in ANGLE shader translator.

The bug is that within each compilation cycle, all the memory allocated through T* types are freed to be reused.  So if certain information is meant to outlive the cycle, it should use the std type instead of the T* type:

1) emulated function vector
2) mapped long names map

BUG=none
TEST=webgl conformance test conformance/glsl/glsl-feature-mod-gentype.html does not crash in Win Debug.
Committed: http://code.google.com/p/angleproject/source/detail?r=773

[Zhenyao Mo, 2011-09-27 21:18:04]

Please review.  (Please also let me know if you think this should be merged back
to Chrome M15 or not).

[kbr1, 2011-09-27 21:22:57]

LGTM. Yes, this should be backported to M15 and possibly earlier.

http://codereview.appspot.com/5137047/diff/1/src/compiler/MapLongVariableNames.h
File src/compiler/MapLongVariableNames.h (right):

http://codereview.appspot.com/5137047/diff/1/src/compiler/MapLongVariableName...
src/compiler/MapLongVariableNames.h:30: std::map<std::string, std::string>&
mVaryingLongNameMap;
A public "typedef std::map<std::string, std::string> StringMap" would shorten
the code a fair amount.