[Ryujit/ARM32] Implement NYI related with overflow for ARM (#10491)

* Implement NYI(overflow checks) for ARM

On last comment of #8496, the NYI message of overflow checks is printed after running the CodeGenBringUpTests.

That was the message about temp register setup for overflow checks.

It was referenced
https://github.com/dotnet/coreclr/blob/master/src/jit/lsraarm64.cpp#L399

I think it doesn't make any problem even though writing it the same as arm64.

* modifiy for coding convention

* Implement NYI : Unimplmented GT_CAST:int <--> int with overflow

I think it doesn't make any problem even though writing it the same as arm64.
So I copied parts of CodeGen::genIntToIntCast() and modified some below codes.

```
if (emitter::emitIns_valid_imm_for_cmp(castInfo.typeMax, cmpSize))
```
-->
```
if (emitter::emitIns_valid_imm_for_cmp(castInfo.typeMax, INS_FLAGS_DONT_CARE))
```

* Implement NYI : genLongToIntCast: overflow check

I copied and pasted codes from codegenxarch.cpp.
But It seemed be necessary that conditional execution values are changed by each architectures.
So I used 'genJumpKindForOper' for getting the emitJumpKind value.

The sample app has been checked to work well.

* Modify the implementation of emitter::emitIns_valid_imm_for_cmp

According to reference manual, I figured out CMP and ADD have different mechanisms on ARM unlike ARM64.
So I defined "...for_cmp" function not just use "..for_add" in the function likes ARM64.

1 files changed, 15 insertions, 1 deletions

diff --git a/src/jit/emitarm.cpp b/src/jit/emitarm.cpp
index f7943f2ffd..77ee3cfc18 100644
--- a/src/jit/emitarm.cpp
+++ b/src/jit/emitarm.cpp
@@ -1380,7 +1380,7 @@ DONE:
 
 /*****************************************************************************
  *
- *  emitIns_valid_imm_for_add() returns true when the immediate 'imm'
+ *  emitins_valid_imm_for_add() returns true when the immediate 'imm'
  *   can be encoded using a single add or sub instruction.
  */
 /*static*/ bool emitter::emitIns_valid_imm_for_add(int imm, insFlags flags)
@@ -1396,6 +1396,20 @@ DONE:
 
 /*****************************************************************************
  *
+ *  emitins_valid_imm_for_cmp() returns true if this 'imm'
+ *   can be encoded as a input operand to an cmp instruction.
+ */
+/*static*/ bool emitter::emitIns_valid_imm_for_cmp(int imm, insFlags flags)
+{
+    if (isModImmConst(imm)) // funky arm immediate
+        return true;
+    if (isModImmConst(-imm)) // funky arm immediate via sub
+        return true;
+    return false;
+}
+
+/*****************************************************************************
+ *
  *  emitIns_valid_imm_for_add_sp() returns true when the immediate 'imm'
  *   can be encoded in "add Rd,SP,i10".
  */