[llvm] [yaml2obj][XOFF] Update yaml2obj for XCOFF to create valid XCOFF files in more cases. (PR #77620)

[James Henderson via llvm-commits]

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+## Case 1: an error is reported when FileOffsetToData is too small
+## RUN: not yaml2obj --docnum=1 %s -o %t 2>&1 | \
+## RUN:   FileCheck %s --check-prefix=ERROR1
+#
+# ERROR1: error: current file offset (60) is bigger than the specified FileOffsetToData for the .text section (48)
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jh7370 wrote:

Nit: Include a blank line between your check and the YAML for improved readability. Applies throughout.

https://github.com/llvm/llvm-project/pull/77620