Ensure we don't underestimate the code size for 4 byte SSE instruction. (dotnet/corec...

Ensure we don't underestimate the code size for 4 byte SSE instruction. (dotnet/coreclr#24555)

* Ensure the code size estimate for emitIns_R_S is correct for 4 byte SSE instruction.

* Centralizing the Is4ByteSSEInstruction size adjustment handling

* Removing unnecessary calls to emitGetVexPrefixAdjustedSize

* Ensure all registers are checked against IsExtendedReg

* Ensure that the ival size is correct for SSE/AVX instructions

* Applying formatting patch

* Ensure all cases for emitIns_R_R_I are covered

* Fixing a inst_RV_RV_IV call to ensure ival fits in a byte

* Centralize some more checks into emitGetAdjustedSize

* Applying formatting patch

Commit migrated from https://github.com/dotnet/coreclr/commit/a3e43d62917bb542e1adda0a06684061ef77067f