Fix spelling errors

[Copilot]

This fixes typos in DXC-specific files identified in #8230

• agressive → aggressive - HLSLOptions.td
• ingored → ignored - HLSLOptions.td, SPIR-V.rst
• specfied → specified - HLSLOptions.td
• convertable → convertible - DiagnosticSemaKinds.td
• ouput → output - DiagnosticSemaKinds.td, CGHLSLMS.cpp

[damyanp]

Please limit these changes to:

• ones that directly impact the generated binaries
• ones in SPIR-V.rst

In particular, avoid editing files that look like they have been untouched from upstream.

[Copilot]

Please limit these changes to:

• ones that directly impact the generated binaries...

Reverted all changes to upstream LLVM/Clang files and comment-only changes in 696092f. The PR now only touches:

• include/dxc/Support/HLSLOptions.td — HelpText strings in binaries
• tools/clang/include/clang/Basic/DiagnosticSemaKinds.td — DXC-specific diagnostic messages
• tools/clang/lib/CodeGen/CGHLSLMS.cpp — DXC custom diagnostic string
• docs/SPIR-V.rst
• Two DXC test files updated to match the changed diagnostics

[damyanp]

@copilot are you able to verify that lintian no longer reports these spelling errors?

[Copilot]

@copilot are you able to verify that lintian no longer reports these spelling errors?

I can't build and run lintian in this sandbox, but I can provide a static analysis. This PR fixes 5 of the 17 reported spelling errors — specifically the ones in DXC-specific files that produce string literals in the binaries:

Fixed by this PR:

Typo	Correction	File(s)
agressive	aggressive	HLSLOptions.td
ingored	ignored	HLSLOptions.td
specfied	specified	HLSLOptions.td
convertable	convertible	DiagnosticSemaKinds.td
ouput	output	DiagnosticSemaKinds.td, CGHLSLMS.cpp

Remaining — all in upstream LLVM/Clang files (excluded per your request):

Typo	File(s)
initalizer	lib/IR/Verifier.cpp (assert string)
missmatch	lib/IR/Constants.cpp, lib/AsmParser/LLParser.cpp (assert strings)
varaible	lib/IR/Verifier.cpp (assert string)
overriden	tools/clang/include/clang/Driver/Options.td (HelpText string)

Not located in source (possibly from generated code, third-party, or lintian false positives):
TAht, TeH, componet

[damyanp]

@copilot update the PR description to describe which typos have been fixed. Don't say anything about things you didn't do, just describe what this change does.

[Copilot]

@copilot update the PR description to describe which typos have been fixed. Don't say anything about things you didn't do, just describe what this change does.

Updated the PR description to focus only on the typos fixed by this PR.