Enable --verify-exclude for hotspot.

ProblemList.txt is "clean" after:
8356866: Cleanup hotspot/jtreg/ProblemList.txt

When "8357048: Fix variable confusion in RunJtreg.gmk" is fixed, enable verification using something like:
```
 diff --git a/make/RunTests.gmk b/make/RunTests.gmk
index 3c0280353a9..cb56695ecc5 100644
--- a/make/RunTests.gmk
+++ b/make/RunTests.gmk
@@ -262,6 +262,7 @@ jdk_JTREG_PROBLEM_LIST += $(TOPDIR)/test/jdk/ProblemList.txt
 jaxp_JTREG_PROBLEM_LIST += $(TOPDIR)/test/jaxp/ProblemList.txt
 langtools_JTREG_PROBLEM_LIST += $(TOPDIR)/test/langtools/ProblemList.txt
 hotspot_JTREG_PROBLEM_LIST += $(TOPDIR)/test/hotspot/jtreg/ProblemList.txt
+hotspot_JTREG_BASIC_OPTIONS += --verify-exclude
 lib-test_JTREG_PROBLEM_LIST += $(TOPDIR)/test/lib-test/ProblemList.txt
 docs_JTREG_PROBLEM_LIST += $(TOPDIR)/test/docs/ProblemList.txt
 
@@ -702,13 +703,13 @@ endef
 # Arg $3 The default value (optional)
 define SetJtregValue
   ifneq ($$($2), )
- $1_$2 := $$($2)
+ $1_$2 = $$($2)
   else
     ifneq ($$($$($1_COMPONENT)_$2), )
- $1_$2 := $$($$($1_COMPONENT)_$2)
+ $1_$2 = $$($$($1_COMPONENT)_$2)
     else
       ifneq ($3, )
- $1_$2 := $3
+ $1_$2 = $3
       endif
     endif
   endif
```