Fix function call line number for calls spanning multiple lines.

Test/spv.debuginfo.multiline.glsl.frag

@@ -0,0 +1,25 @@
+#version 460
+
+in float inx;
+out float outx;
+
+float add(float x, float y, float z) {
+    return 
+        x
+        +
+        y
+        +
+        z
+    ;
+}
+
+void main() {
+    outx
+        =
+        add(
+            inx+1,
+            inx+2,
+            inx+3
+        )
+    ;
+}