Update Kotlin compiler to custom 1.4.20 with IR fixes.

This is built from the 1.4.20 sources with minor patches that only
affect the compiler with using the -Xuse-ir flag to use the new
IR-based backend.

Build from https://github.com/google/kotlin/tree/google-ir
Build by builder: https://ci.chromium.org/p/r8/builders/ci/kotlin-builder

Test: make
Test: atest com.android.systemui

Change-Id: I5efb91ce9b19315b8239f372d01198a554b84d19
39 files changed