Remove unnecessary checks on String methods

[IBMJimmyk]

Removes boundchks and nullchks for trusted String methods that will never trigger the checks. This includes:

AbstractStringBuilder.append AbstractStringBuilder.putStringAt AbstractStringBuilder.ensureCapacityInternal AbstractStringBuilder.inflateIfNeededFor StringBuilder.append String.substring StringLatin1.newString String.deduplicateStrings

The checks can be restored by setting the TR_DisableStringChkSkips envvar.

[IBMJimmyk]

@zl-wang Could you take a look at this when you get the chance?

[zl-wang]

Jenkins test sanity plinux,xlinux,zlinux jdk8,jdk21

[vijaysun-omr]

Is it only null checks being skipped for these methods ? i.e. bound checks are not being skipped ?

[zl-wang]

both pending and failure look like infrastructure issues (JITServer failing to set up on s390 and sanity.openjdk didn't run at all on x86 linux. Merging ...

[IBMJimmyk]

This list of methods didn't have any bound chks to begin with so it was only null chks being skipped this time.