RFR: 8348367: Remove hotspot_not_fast_compiler and hotspot_slow_compiler test groups

[Leonid Mesnik]

Test groups
hotspot_not_fast_compiler and hotspot_slow_compiler test
were used by Oracle. However, now tier2/tier3 are used instead.

So fix remove groups. and add exclusion of "slow" tests from tier1 groups. The content remains the same except 
-compiler/memoryinitialization/ZeroTLABTest.java 
int tier1_compiler_3.


The tier1/2/3 are organized similar to tiers in other groups where
tier1 = set of groups 
  - some long tests/groups
tier2 = set of groups
  - some long tests/groups
 - tier1
 tier3 =
  hotspot_compiler
 - tier1
 - tier2


The  test group
 compiler/codegen/ \
was in the tier1 and tier2, so should be removed it from tier2, not tests are affected.

-------------

Commit messages:
 - 8348367: Remove hotspot_not_fast_compiler and hotspot_slow_compiler test groups

Changes: https://git.openjdk.org/jdk/pull/23253/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23253&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348367
  Stats: 28 lines in 1 file changed: 5 ins; 19 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23253.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23253/head:pull/23253

PR: https://git.openjdk.org/jdk/pull/23253