Shader bug r12p1

I've recently discovered shader sampling bug on r12p1 on S7 series. Looks visually similar to what we previously had on r7p0.

Reproducing issue

Scenario 1.

Dolphin emulator:

http://dl.dolphin-emu.org/builds/dolphin-master-5.0-600.apk

Homebrew demo:

Neo Tanks - WiiBrew

Unzip downloaded archive, in Dolphin set path to unpacked folder and choose boot.dol, swipe right to a folder icon, run boot.dol.

Screenshots:

r12p1: https://s13.postimg.io/7ca1duydz/download_20160914_002047.png

v145: https://s17.postimg.io/77mtbf2gv/download_20160914_002058.png

Scenario 2:

Seascape Benchmark - Android Apps on Google Play (totally black screen)

Screenshots:

r12p1: https://s15.postimg.io/k1glc3ycb/Screenshot_20160913_234123.png

v145: https://s21.postimg.io/i1ire4gvb/download_20160914_004921.png

Scenario 3:

REV Vehicle Demo - Android Apps on Google Play

(Missing shaders)

Screenshots:

r12p1: https://s11.postimg.io/jbivi1n9f/download_20160914_002118.png

https://s17.postimg.io/chb8p9rin/download_20160914_002120.png

v145: https://s17.postimg.io/xawj9qvzz/download_20160914_002111.png

https://s10.postimg.io/fejl93v49/download_20160914_002114.png