RFR: 8311993: Test serviceability/sa/UniqueVtableTest.java failed: duplicate vtables detected [v3]

[Alex Menkov]

> On Windows SA agent gets a class vtable from symbols, exported from jvm.dll (it exports symbols like "??_7" + type + "@@6B@").
> But symbol lookup function first requests WinDbg about the symbol.
> Sometimes WinDbg routine IDebugSymbols::GetOffsetByName() returns offset for both class and class pointer types. Returned offsets correspond to symbols like "jvm!class_name::`vftable'".
> The behavior is intermittent, I was not able to find what is the reason.
> The fix adds workaround for the case - if GetOffsetByName succeeded, we check if corresponding symbol contains requested one.
> So it returns expected offset for non-vtable symbols like "MaxJNILocalCapacity" (GetOffsetByName returns offset for "jvm!MaxJNILocalCapacity"), but returns 0 for vtlb lookup.
> 
> Additionally added check for results of IDebugSymbols::SetImagePath/SetSymbolPath
> 
> Testing: tier1,tier2,hs-tier5-svc

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  removed extra space

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20684/files
  - new: https://git.openjdk.org/jdk/pull/20684/files/448ceec2..d28a59e6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20684&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20684&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20684.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20684/head:pull/20684

PR: https://git.openjdk.org/jdk/pull/20684