Inline String.fromCharCode in hydrogen.

Inline String.fromCharCode in hydrogen.

BUG=

Committed: https://code.google.com/p/v8/source/detail?r=14315

[Toon Verwaest, 2013-04-16 22:19:30]

lgtm with comments

https://codereview.chromium.org/14296009/diff/1/src/hydrogen.cc
File src/hydrogen.cc (right):

https://codereview.chromium.org/14296009/diff/1/src/hydrogen.cc#newcode8552
src/hydrogen.cc:8552: printf("cool\n");
Please remove.

https://codereview.chromium.org/14296009/diff/1/src/runtime.cc
File src/runtime.cc (right):

https://codereview.chromium.org/14296009/diff/1/src/runtime.cc#newcode2419
src/runtime.cc:2419: if (char_code->ToArrayIndex(&code)) {
This currently works by accident I presume; given that ToArrayIndex has a buggy
implementation. 0xFFFFFFFF isn't a valid array index, even though currently we
interpret it as such. This probably wants to convert it to a valid UInt32;
probably best to fix up the API usage to avoid future breakage. And maybe add a
test for 0xFFFFFFFF if there isn't one yet.

[Yang, 2013-04-17 16:37:19]

Committed patchset #2 manually as r14315 (presubmit successful).