Fix typo in compiler.

Fix typo in compiler.

BUG=
R=msimprovertechnologies@gmail.com, sra@google.com

Committed: https://github.com/dart-lang/sdk/commit/7ad29a2fa33af1cd8e545f06458c90638d73b30c
Reverted: https://github.com/dart-lang/sdk/commit/7917485d890db47ca7fed9c157655eddf4d5b58b

Committed: https://github.com/dart-lang/sdk/commit/0a55500c61dddcc293df2ddf853a4c34985d53fe

[kaendfinger, 2015-05-16 05:09:42]

kaendfinger@gmail.com changed reviewers:
+ floitsch@google.com, rakudrama@gmail.com

[sra1, 2015-05-16 17:33:44]

sra@google.com changed reviewers:
+ sra@google.com

[sra1, 2015-05-16 17:33:45]

lgtm

[MSI Team, 2015-05-16 20:08:26]

msimprovertechnologies@gmail.com changed reviewers:
+ msimprovertechnologies@gmail.com

[MSI Team, 2015-05-16 20:08:26]

LGTM

[floitsch, 2015-05-18 16:53:12]

Committed patchset #1 (id:1) manually as
7ad29a2fa33af1cd8e545f06458c90638d73b30c (presubmit successful).

[floitsch, 2015-05-18 17:10:17]

I committed the CL the wrong way and therefore reverted it.
Trying again now.

[floitsch, 2015-05-18 17:12:14]

Committed patchset #1 (id:1) manually as
0a55500c61dddcc293df2ddf853a4c34985d53fe (presubmit successful).