[llvm][NVPTX] Don't reorder MIs that construct a PTX function call (#116522)

With "-enable-misched", MachineScheduler can reorder MIs that must stick
together (in initially set order) to generate legal PTX code for a
function call.

When generating PTX code for the attached test (using LLVM before this
revision), the following invalid PTX code is generated:

```
  { // callseq 0, 0
  .param .b64 param0;
  st.param.f64  [param0], 0d0000000000000000;
  .param .b64 retval0;
  call.uni (retval0),
  mul.lo.s32  %r7, %r10, %r3;
  or.b32    %r8, %r4, %r7;
  mul.lo.s32  %r9, %r2, %r8;
  cvt.rn.f64.s32  %fd3, %r9;
  quux,
  (
  param0
  );
  ld.param.f64  %fd1, [retval0];
  } // callseq 0
```

0 files changed, 0 insertions, 0 deletions