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Update test case by using MIR

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update test cases mentioned in PR47462

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update test case

Do you have any plan to support throttling for horizontal reduction?

update test case for this patch

In D71774#1821760, @lenary wrote:

This seems like a fun issue:

• addi is compressible
• xor is almost certainly easier to analyse (from the view of KnownBits and the like).

Have you seen any regressions in code generation from this change?

No, there's no any regressions. For the case where the register is compared with an immediate value (equal or unequal), using xori or addi with neg imm in the pattern seteq or setne is equivalent, in order to get a result equal to 0 or not equal to 0.

The case was from dhrystone(dhry_2.c):

Boolean Func_3 (Enum_Par_Val)
/***************************/
    /* executed once        */
    /* Enum_Par_Val == Ident_3 */

Fix some typos and add a new function lowerReturnVal

@lenary @asb It seems that PEI::calculateFrameObjectOffsets function in PrologEpilogInserter pass has done some stack size rounding up work. Each stack object will call AdjustStackOffset to adjust the stack frame offset, and corresponding update may be made for MaxAlign.
Also, there's a TFI hook targetHandlesStackFrameRounding to decide if the target is responsible for rounding up the stack frame(default return false). For RISCV, maybe this function should return true I think, thus the stack size for StackRealignment will be calculated at RISCV's emitPrologue time.
For the implementation in this patch, the stack size for StackRealignment will be calculathed two times, one in PEI::calculateFrameObjectOffsets, another time in RISCVFrameLowering::determineFrameLayout, and the stack size may become bigger.)

In D65218#1604143, @lenary wrote:

Please can you merge this into D65219, given these changes are relevant to that patch? It's hard to know if these changes are "correct" without the context of that patch.

Some changes for this update:

1. Rename the GPRRegBank from GPR to GPRB
2. Add using of RISCVInstructionSelector::selectImpl in RISCVInstructionSelector.cpp.
3. Add a seperate test case for running all globalisel passes.