[release/9.0-staging] Fix System.Reflection.Emit SetChecksum
creating invalid pdb
#110205
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Backport of #110097 to release/9.0-staging
Fixes #110096.
/cc @steveharter @tgjones
Customer Impact
This is preventing the use of PDBs with source document checksums that allow, for example, the source .cs file to be verified it has not been altered.
Regression
This code was introduced in v9 in this PR which had the bug.
Testing
This PR added the test.
Risk
Low. The fix is straightforward and one LOC.