Change Details

1. Support ABI checking with per function target-features if users don't specific -mattr, the default target-feature come from IR attribute. 2. Enable LTO for RISCV 3. Init MCOptions.ABIName via module flag metadata

1. Support ABI checking with per function target-features if users don't specific -mattr, the default target-feature come from IR attribute. 2. Enable LTO for RISCV 3. add TargetMachine::initTargetOptions to overwirte MCOptions.ABINameaccording to module info

1. Support ABI checking with per function target-features if users don't specific -mattr, the default target-feature come from IR attribute. 2. Enable LTO for RISCV 3. Initadd TargetMachine::initTargetOptions to overwirte MCOptions.ABIName via module flag metadataaccording to module info