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74275a1103
For each intrinsic with ManualCodegen block will generate something like
below:
```cpp
SegInstSEW = 0;
...
if (SegInstSEW == (unsigned)-1) {
auto PointeeType = E->getArg(4294967295)->getType()->getPointeeType();
SegInstSEW = llvm::Log2_64(getContext().getTypeSize(PointeeType));
}
```
But actually SegInstSEW is table-gen-time constant, so can remove that
if-check and directly use the constant.
This change reduce riscv_vector_builtin_cg.inc around 6600 lines (30913
to 24305) which is around 20% reduction, however seems this isn't impact
the build time much since the redundant dead branch is almost will
optimized away by compiler in early stage.