ARMFastISel doesn't support thumb1.  Rename isThumb to isThumb2 to reflect this. No functional change intended.
ARMFastISel doesn't support thumb1.  Rename isThumb to isThumb2 to reflect this.
No functional change intended.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@144122 91177308-0d34-0410-b5e6-96231b3b80d8

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