Fixes a number of dEQP tests that use over 4kB's of allocas on Win32.

Bug: b/135866359
Change-Id: I0e50eea6a70d284c8d653fb070f4ae982c02914c
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33213Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>