[NativeAOT] Fix shift math helpers to mask the shift operand

[filipnavara]

Match the JIT code:

runtime/src/coreclr/vm/jithelpers.cpp

Lines 455 to 475 in 988958f

	HCIMPL2_VV(UINT64, JIT_LLsh, UINT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num << (shift & 0x3F);
	}
	HCIMPLEND
	/*********************************************************************/
	HCIMPL2_VV(INT64, JIT_LRsh, INT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num >> (shift & 0x3F);
	}
	HCIMPLEND
	/*********************************************************************/
	HCIMPL2_VV(UINT64, JIT_LRsz, UINT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num >> (shift & 0x3F);
	}

Fixes following Pri0 tests on arm32:

• JIT/Regression/JitBlue/GitHub_15291
• JIT/Regression/JitBlue/GitHub_15949

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Issue Details

---

Match the JIT code:

runtime/src/coreclr/vm/jithelpers.cpp

Lines 455 to 475 in 988958f

	HCIMPL2_VV(UINT64, JIT_LLsh, UINT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num << (shift & 0x3F);
	}
	HCIMPLEND
	/*********************************************************************/
	HCIMPL2_VV(INT64, JIT_LRsh, INT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num >> (shift & 0x3F);
	}
	HCIMPLEND
	/*********************************************************************/
	HCIMPL2_VV(UINT64, JIT_LRsz, UINT64 num, int shift)
	{
	FCALL_CONTRACT;
	return num >> (shift & 0x3F);
	}

Fixes following Pri0 tests on arm32:

• JIT/Regression/JitBlue/GitHub_15291
• JIT/Regression/JitBlue/GitHub_15949

Author:	filipnavara
Assignees:	-
Labels:	area-NativeAOT-coreclr
Milestone:	-

[jkotas]

Thanks