Fix the shader calculation for the level of detail for certain samplers.
Fix the shader calculation for the level of detail for certain samplers.

We were using an extra sqrt function for some cases.

TRAC #23591

Change-Id: I7d5d2b4b78586085396a281daf7975be316a1386
Signed-off-by: Shannon Woods
Signed-off-by: Geoff Lang

crezefire/angle,ghostoy/angle,bsergean/angle,ecoal95/angle,larsbergstrom/angle,android-ia/platform_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,mlfarrell/angle,android-ia/platform_external_chromium_org_third_party_angle,mlfarrell/angle,xin3liang/platform_external_chromium_org_third_party_angle,MSOpenTech/angle,mybios/angle,MIPS/external-chromium_org-third_party-angle,mikolalysenko/angle,vvuk/angle,csa7mdm/angle,mikolalysenko/angle,larsbergstrom/angle,bsergean/angle,vvuk/angle,csa7mdm/angle,MIPS/external-chromium_org-third_party-angle,mrobinson/rust-angle,ecoal95/angle,bsergean/angle,ppy/angle,MSOpenTech/angle,domokit/waterfall,mybios/angle,ecoal95/angle,jgcaaprom/android_external_chromium_org_third_party_angle,nandhanurrevanth/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,mrobinson/rust-angle,mlfarrell/angle,xin3liang/platform_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,ecoal95/angle,MIPS/external-chromium_org-third_party-angle,mrobinson/rust-angle,larsbergstrom/angle,crezefire/angle,jgcaaprom/android_external_chromium_org_third_party_angle,ppy/angle,csa7mdm/angle,MIPS/external-chromium_org-third_party-angle,ghostoy/angle,mrobinson/rust-angle,mybios/angle,mybios/angle,larsbergstrom/angle,MSOpenTech/angle,ppy/angle,vvuk/angle,nandhanurrevanth/angle,nandhanurrevanth/angle,android-ia/platform_external_chromium_org_third_party_angle,mikolalysenko/angle,csa7mdm/angle,ppy/angle,ghostoy/angle,ecoal95/angle,bsergean/angle,mikolalysenko/angle,mrobinson/rust-angle,nandhanurrevanth/angle,crezefire/angle,ghostoy/angle,vvuk/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,mlfarrell/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,MSOpenTech/angle,crezefire/angle,xin3liang/platform_external_chromium_org_third_party_angle,domokit/waterfall