[RISCV] Support .option relax and .option norelax

This extends the .option support from D45864 to enable/disable the relax 
feature flag from D44886

During parsing of the relax/norelax directives, the RISCV::FeatureRelax 
feature bits of the SubtargetInfo stored in the AsmParser are updated 
appropriately to reflect whether relaxation is currently enabled in the 
parser. When an instruction is parsed, the parser checks if relaxation is 
currently enabled and if so, gets a handle to the AsmBackend and sets the 
ForceRelocs flag. The AsmBackend uses a combination of the original 
RISCV::FeatureRelax feature bits set by e.g -mattr=+/-relax and the 
ForceRelocs flag to determine whether to emit relocations for symbol and 
branch diffs. Diff relocations should therefore only not be emitted if the 
relax flag was not set on the command line and no instruction was ever parsed 
in a section with relaxation enabled to ensure correct diffs are emitted.

Differential Revision: https://reviews.llvm.org/D46423
Patch by Lewis Revill.

llvm-svn: 346655

0 files changed, 0 insertions, 0 deletions