Currently visitIntrinsicInst() is a long, partly unsorted list. This patch groups them into cross-platform, X86 SIMD, and Arm SIMD families, making the overall intent of visitIntrinsicInst() clearer:
```
void visitIntrinsicInst(IntrinsicInst &I) {
if (maybeHandleCrossPlatformIntrinsic(I))
return;
if (maybeHandleX86SIMDIntrinsic(I))
return;
if (maybeHandleArmSIMDIntrinsic(I))
return;
if (maybeHandleUnknownIntrinsic(I))
return;
visitInstruction(I);
}
```
There is one disadvantage: the compiler will not tell us if the switch statements in the handlers have overlapping coverage.
5dafe66f07