hardware/ErgoDox: Hint at GCC that some functions are critical path

Based on a similar change to `ATMegaKeyboard`.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/hardware/ez/ErgoDox.cpp

@@ -82,7 +82,7 @@ ISR(TIMER1_OVF_vect) {
   do_scan_ = true;
 }
 
-void ErgoDox::readMatrixRow(uint8_t row) {
+void __attribute__((optimize(3))) ErgoDox::readMatrixRow(uint8_t row) {
   uint8_t mask, cols;
 
   mask = debounceMaskForRow(row);
@@ -91,7 +91,7 @@ void ErgoDox::readMatrixRow(uint8_t row) {
   keyState_[row] = cols;
 }
 
-void ErgoDox::readMatrix() {
+void __attribute__((optimize(3))) ErgoDox::readMatrix() {
   do_scan_ = false;
 
   scanner_.reattachExpanderOnError();
@@ -107,7 +107,7 @@ void ErgoDox::readMatrix() {
   }
 }
 
-void ErgoDox::actOnMatrixScan() {
+void __attribute__((optimize(3))) ErgoDox::actOnMatrixScan() {
   for (byte row = 0; row < ROWS; row++) {
     for (byte col = 0; col < COLS; col++) {
       uint8_t keyState = (bitRead(previousKeyState_[row], col) << 0) |

src/kaleidoscope/hardware/ez/ErgoDox/ErgoDoxScanner.cpp

@@ -99,7 +99,7 @@ ErgoDoxScanner::begin() {
   initCols();
 }
 
-void
+void __attribute__((optimize(3)))
 ErgoDoxScanner::selectRow(int row) {
   if (row < 7) {
     if (!expander_error_) {
@@ -149,7 +149,7 @@ out:
   }
 }
 
-void
+void __attribute__((optimize(3)))
 ErgoDoxScanner::unselectRows() {
   DDRB  &= ~(1 << 0 | 1 << 1 | 1 << 2 | 1 << 3);
   PORTB &= ~(1 << 0 | 1 << 1 | 1 << 2 | 1 << 3);
@@ -159,7 +159,7 @@ ErgoDoxScanner::unselectRows() {
   PORTC &= ~(1 << 6);
 }
 
-uint8_t
+uint8_t __attribute__((optimize(3)))
 ErgoDoxScanner::readCols(int row) {
   if (row < 7) {
     if (expander_error_) {