This reverts commit 9878ef3abd2a48fcfb81357d581dac292b52ddb3.

Needs more discussion of the semantics of the align attribute. See:
https://discourse.llvm.org/t/rfc-enhancing-function-alignment-attributes/88019

This reverts commit 05e08cdb3e576cc0887d1507ebd2f756460c7db7.
Adding the missing -mtriple flags in MIR/X86 test files which caused
these tests to fail which was the reason for reverting the patch.

Reverts llvm/llvm-project#87574, which breaks LLVM ::
CodeGen/MIR/X86/call-site-info-ambiguous-indirect-call-typeid.mir tests
on linux-arm64 builders.

Introducing `EnableCallGraphSection` target option to add
CalleeTypeIds field in CallSiteInfo. Read the callee type ids
in and out by the MIR parser/printer.

Reviewers: ilovepi

Reviewed By: ilovepi

Pull Request: https://github.com/llvm/llvm-project/pull/87574

Reviewers: arsenm, efriedma-quic

Reviewed By: arsenm

Pull Request: https://github.com/llvm/llvm-project/pull/149444

Deleting a basic block removes all references from jump tables, which
is O(n). When freeing a MachineFunction, all basic blocks are deleted
before the jump tables, causing O(n^2) runtime. Fix this by deallocating
the jump table first.

Test case generator:

    import sys

    n = int(sys.argv[1])
    print("define void @f(i64 %c, ptr %p) {")
    print("  switch i64 %c, label %d [")
    for i in range(n):
        print(f"    i64 {i}, label %h{i}")
    print(f"  ]")
    for i in range(n):
        print(f'h{i}:')
        print(f'  store i64 {i*i}, ptr %p')
        print(f'  ret void')
    print('d:')
    print('  ret void')
    print('}')

Improvement at 5000 entries:

    Benchmark 1: ./llc.pre -filetype=obj -O0 <switch5k.bc
      Time (mean ± σ):      49.7 ms ±   1.0 ms
      Range (min … max):    48.0 ms …  52.1 ms    57 runs

    Benchmark 2: ./llc.post -filetype=obj -O0 <switch5k.bc
      Time (mean ± σ):      39.4 ms ±   0.8 ms
      Range (min … max):    37.1 ms …  41.1 ms    72 runs

    Summary
      ./llc.post -filetype=obj -O0 <switch5k.bc ran
        1.26 ± 0.04 times faster than ./llc.pre -filetype=obj -O0 <switch5k.bc

Improvement at 20000 entries:

    Benchmark 1: ./llc.pre -filetype=obj -O0 <switch20k.bc
      Time (mean ± σ):     281.7 ms ±   1.0 ms
      Range (min … max):   280.2 ms … 283.0 ms    10 runs

    Benchmark 2: ./llc.post -filetype=obj -O0 <switch20k.bc
      Time (mean ± σ):     123.9 ms ±   1.5 ms
      Range (min … max):   121.4 ms … 129.2 ms    23 runs

    Summary
      ./llc.post -filetype=obj -O0 <switch20k.bc ran
        2.27 ± 0.03 times faster than ./llc.pre -filetype=obj -O0 <switch20k.bc

Pull Request: https://github.com/llvm/llvm-project/pull/144108