Changes

[X86] Add icmp ne/eq (srl (ctlz x), log2(bw)) test coverage.

Add vector coverage as well (which isn't currently supported).

Remove some unused <vector> includes. NFCI.

<vector> (unlike many other c++ headers) is relatively clean, so if the file doesn't use std::vector then it shouldn't need the header.

[AArch64] Rearrange mul(dup(sext/zext)) to mul(sext/zext(dup))

Performing this rearrangement allows for existing patterns
to match cases where the vector may be built after an extend,
instead of before.

Differential Revision: https://reviews.llvm.org/D91255

[TargetLowering] Add icmp ne/eq (srl (ctlz x), log2(bw)) vector support.

[flang][driver] Add support for `-D`, `-U`

Add support for options -D and -U in the new Flang driver.

Summary of changes:
  - Create PreprocessorOptions, to be used by the driver then translated
    into Fortran::parser::Options
  - Create CompilerInvocation::setFortranOpts to pass preprocessor
    options into the parser options
  - Add a dedicated method, Flang::AddPreprocessingOptions, to extract
    preprocessing options from the driver arguments into the preprocessor
    command arguments

Macros specified like -DName will default to definition 1.

When defining macros, the new driver will drop anything after an
end-of-line character. This is consistent with gfortran and clang, but
different to what currently f18 does. However, flang (which is a bash
wrapper for f18), also drops everything after an end-of-line character.
So gfortran-like behaviour felt like the natural choice. Test is added
to demonstrate this behaviour.

Reviewed By: awarzynski

Differential Revision: https://reviews.llvm.org/D93401