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/IntermNode.cpp b/src/compiler/translator/IntermNode.cpp
index c7319f5..61d4cf3 100644
--- a/src/compiler/translator/IntermNode.cpp
+++ b/src/compiler/translator/IntermNode.cpp
@@ -151,7 +151,7 @@
         case EOpClamp:
         case EOpMix:
         case EOpStep:
-        case EOpSmoothStep:
+        case EOpSmoothstep:
         case EOpLdexp:
         case EOpMulMatrixComponentWise:
         case EOpOuterProduct:
@@ -1021,8 +1021,8 @@
                           static_cast<unsigned char>(mOperand->getType().getRows()),
                           static_cast<unsigned char>(mOperand->getType().getCols())));
             break;
-        case EOpIsInf:
-        case EOpIsNan:
+        case EOpIsinf:
+        case EOpIsnan:
             setType(TType(EbtBool, EbpUndefined, resultQualifier, operandPrimarySize));
             break;
         case EOpBitfieldReverse:
@@ -2537,12 +2537,12 @@
                 break;
             }
 
-            case EOpIsNan:
+            case EOpIsnan:
                 ASSERT(getType().getBasicType() == EbtFloat);
                 resultArray[i].setBConst(gl::isNaN(operandArray[0].getFConst()));
                 break;
 
-            case EOpIsInf:
+            case EOpIsinf:
                 ASSERT(getType().getBasicType() == EbtFloat);
                 resultArray[i].setBConst(gl::isInf(operandArray[0].getFConst()));
                 break;
@@ -2607,7 +2607,7 @@
                     foldFloatTypeUnary(operandArray[i], &sqrtf, &resultArray[i]);
                 break;
 
-            case EOpInverseSqrt:
+            case EOpInversesqrt:
                 // There is no stdlib built-in function equavalent for GLES built-in inversesqrt(),
                 // so getting the square root first using builtin function sqrt() and then taking
                 // its inverse.
@@ -3230,7 +3230,7 @@
             break;
         }
 
-        case EOpSmoothStep:
+        case EOpSmoothstep:
         {
             ASSERT(basicType == EbtFloat);
             resultArray = new TConstantUnion[maxObjectSize];