Allow GLSL construction of matrix from matrix, starting with version 120, and always for ES shaders.

git-svn-id: https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/tools/glslang@20544 e7fa87d3-cd2b-0410-9028-fcbf551c1848

Test/120.frag

@@ -9,6 +9,9 @@ float precision;
 in vec4 i;
 out vec4 o;
 
+uniform mat4x2 m;
+
 void main()
 {
+    mat2x3 m23 = mat2x3(m);
 }

glslang/MachineIndependent/ParseHelper.cpp

@@ -587,8 +587,8 @@ bool TParseContext::constructorErrorCheck(int line, TIntermNode* node, TFunction
     }
 
     if (matrixInMatrix && !type->isArray()) {
-        error(line, "constructing matrix from matrix", "constructor", "(reserved)");
-        return true;
+        profileRequires(line, ENoProfile, 120, 0, "constructing matrix from matrix");
+        return false;
     }
 
     if (overFull) {