[mips][microMIPS] add lapc instruction

Implement LAPC instruction for mips32r6, mips64r6 and micromips32r6.

Patch by Milos Stojanovic.

Differential Revision: https://reviews.llvm.org/D35984


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312934 91177308-0d34-0410-b5e6-96231b3b80d8
17 files changed