RFR: Fix SCCache stats logged on exit [v2]

[Ashutosh Mehra]

> The count of various SCCEntry kinds is not correctly computed. This patch fixes it.
> This code was introduced as part of i2c2i adapters and was picked up from Andrew Dinn's work on storing stub and blobs. Clearly I messed it up.
> The patch also computes and shows the counts for old entries and new entries separately. Though not useful for now, but in incremental workflow it may be helpful to distinguish between the old and new entries.

Ashutosh Mehra has updated the pull request incrementally with one additional commit since the last revision:

  Add AOTCodeStats to collect stats about the AOT code
  
  Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>

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Changes:
  - all: https://git.openjdk.org/leyden/pull/42/files
  - new: https://git.openjdk.org/leyden/pull/42/files/dd9432eb..3ae2b845

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=leyden&pr=42&range=01
 - incr: https://webrevs.openjdk.org/?repo=leyden&pr=42&range=00-01

  Stats: 291 lines in 2 files changed: 195 ins; 67 del; 29 mod
  Patch: https://git.openjdk.org/leyden/pull/42.diff
  Fetch: git fetch https://git.openjdk.org/leyden.git pull/42/head:pull/42

PR: https://git.openjdk.org/leyden/pull/42