Rename operator enums so they can be autogenerated

Camel casing is removed from the enums where it differs from the GLSL
spec. This way it's easier to autogenerate code for built-in
functions mapped to operators.

BUG=angleproject:2267
TEST=angle_unittests

Change-Id: I2490d5d0e8ffb45eba343f225f76779e63381a65
Reviewed-on: https://chromium-review.googlesource.com/929361
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
diff --git a/src/compiler/translator/OutputGLSLBase.cpp b/src/compiler/translator/OutputGLSLBase.cpp
index 2e19264..f04127f 100644
--- a/src/compiler/translator/OutputGLSLBase.cpp
+++ b/src/compiler/translator/OutputGLSLBase.cpp
@@ -734,7 +734,7 @@
         case EOpExp2:
         case EOpLog2:
         case EOpSqrt:
-        case EOpInverseSqrt:
+        case EOpInversesqrt:
         case EOpAbs:
         case EOpSign:
         case EOpFloor:
@@ -743,8 +743,8 @@
         case EOpRoundEven:
         case EOpCeil:
         case EOpFract:
-        case EOpIsNan:
-        case EOpIsInf:
+        case EOpIsnan:
+        case EOpIsinf:
         case EOpFloatBitsToInt:
         case EOpFloatBitsToUint:
         case EOpIntBitsToFloat:
@@ -955,7 +955,7 @@
         case EOpClamp:
         case EOpMix:
         case EOpStep:
-        case EOpSmoothStep:
+        case EOpSmoothstep:
         case EOpFrexp:
         case EOpLdexp:
         case EOpDistance: