[TLI] Fix breakage introduced by D21739.

The initialize function has an early return for AMDGPU targets.  If taken,
the ShouldExtI32* initialization code will not be executed, resulting in
invalid values in the corresponding fields.  Fix this by moving the code
to the top of the function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287570 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed