[mips][micromips] Fix how values in .gcc_except_table are calculated

When a landing pad is calculated in a program that is compiled for micromips
with -fPIC flag, it will point to an even address.
Such an error will cause a segmentation fault, as the instructions in
micromips are aligned on odd addresses. This patch sets the last bit of the
offset where a landing pad is, to 1, which will effectively be an odd
address and point to the instruction exactly.

r344591 fixed this issue for -static compilation.

Patch by Aleksandar Beserminji.

Differential Revision: https://reviews.llvm.org/D57677

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353480 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed