[MLIR][SPIRVToLLVM] Indentation and style fix in tests

Second patch with test fixes. Redundant `%{{.*}} = `
removed, label checks added, tabs converted to spaces and
some namings are changed to match the convention.

Fixed tests:
- constant-op-to-llvm
- func-ops-to-llvm (renamed)
- memory-ops-to-llvm
- misc-ops-to-llvm
- module-ops-to-llvm
- shift-ops-to-llvm (renamed)
- spirv-types-to-llvm-invalid (renamed)

Reviewed By: ftynse, rriddle

Differential Revision: https://reviews.llvm.org/D85206