vulkan: opengl: measure and report compilation times

To help figure out the source of slow shader compilations.
12 jobs for master in 8 minutes and 27 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Compile
passed #639430
aarch64 docker
aarch64

00:00:09

passed #639426
amd64 docker
linux

00:00:09

passed #639431
catalina amd64
macos

00:00:08

passed #639432
amd64 docker
scan

00:00:36

passed #639427
amd64 docker
static

00:00:11

passed #639428
amd64 docker
win32

00:00:21

passed #639429
amd64 docker
win64

00:00:17

 
  Test
passed #639434
gpu
gpu

00:02:05

78.4547%
passed #639433
amd64 docker
llvmpipe

00:00:34

 
  Sanitize
passed #639435
gpu
asan

00:02:17

passed #639436
gpu
msan

00:01:40

passed #639437
gpu
ubsan

00:01:46